public abstract class GroupMatchingIterator extends Object implements LookaheadIterator, GroupIterator
| Modifier and Type | Field and Description |
|---|---|
protected XPathContext |
baseContext |
protected Item |
current |
protected List |
currentMembers |
protected Item |
next |
protected Pattern |
pattern |
protected SequenceIterator |
population |
protected int |
position |
protected XPathContext |
runningContext |
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD| Constructor and Description |
|---|
GroupMatchingIterator() |
| Modifier and Type | Method and Description |
|---|---|
protected abstract void |
advance() |
void |
close()
Close the iterator.
|
Item |
current()
Get the current value in the sequence (the one returned by the
most recent call on next()).
|
AtomicSequence |
getCurrentGroupingKey()
Get the grouping key of the current group
|
int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
|
ManualGroupIterator |
getSnapShot(XPathContext context)
Get a sequence which is a snapshot of this sequence at the current position
|
boolean |
hasCurrentGroup()
Ask whether this iterator has a current group
|
boolean |
hasCurrentGroupingKey()
Ask whether this iterator has a current grouping key
|
boolean |
hasNext()
Determine whether there are more items to come.
|
SequenceIterator |
iterateCurrentGroup()
Get an iterator over the members of the current group, in population
order.
|
Item |
next()
Get the next item in the sequence.
|
int |
position()
Get the current position.
|
void |
setGroupSlot(int groupSlot)
Set a local variable slot to hold the value of the current group
|
void |
setKeySlot(int keySlot)
Set a local variable slot to hold the value of the current grouping key
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetAnotherprotected SequenceIterator population
protected Pattern pattern
protected XPathContext baseContext
protected XPathContext runningContext
protected List currentMembers
protected Item next
protected Item current
protected int position
public void setGroupSlot(int groupSlot)
GroupIteratorsetGroupSlot in interface GroupIteratorgroupSlot - the stack frame position of the variable holding the current grouppublic void setKeySlot(int keySlot)
GroupIteratorsetKeySlot in interface GroupIteratorkeySlot - the stack frame position of the variable holding the current grouping keyprotected abstract void advance()
throws XPathException
XPathExceptionpublic AtomicSequence getCurrentGroupingKey()
GroupIteratorgetCurrentGroupingKey in interface GroupIteratorpublic SequenceIterator iterateCurrentGroup()
GroupIteratoriterateCurrentGroup in interface GroupIteratorpublic boolean hasCurrentGroup()
GroupIteratorhasCurrentGroup in interface GroupIteratorpublic boolean hasCurrentGroupingKey()
GroupIteratorhasCurrentGroupingKey in interface GroupIteratorpublic boolean hasNext()
LookaheadIteratorSequenceIterator.LOOKAHEADhasNext in interface LookaheadIteratorpublic Item next() throws XPathException
SequenceIteratornext in interface SequenceIteratorXPathException - if an error occurs retrieving the next itempublic Item current()
SequenceIteratorcurrent in interface SequenceIteratorpublic int position()
SequenceIteratorThis method does not change the state of the iterator.
position in interface SequenceIteratorpublic void close()
SequenceIterator(Currently, closing an iterator is important only when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.)
close in interface SequenceIteratorpublic int getProperties()
SequenceIteratorgetProperties in interface SequenceIteratorSequenceIterator.GROUNDED, SequenceIterator.LAST_POSITION_FINDER,
and SequenceIterator.LOOKAHEAD. It is always
acceptable to return the value zero, indicating that there are no known special properties.
It is acceptable for the properties of the iterator to change depending on its state.public ManualGroupIterator getSnapShot(XPathContext context) throws XPathException
GroupIteratorgetSnapShot in interface GroupIteratorXPathExceptionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.